STIGQter: STIG Summary: IBM z/OS TSS Security Technical Implementation Guide Version: 8 Release: 2 Benchmark Date: 23 Apr 2021:

IBM z/OS libraries included in the system REXXLIB concatenation must be properly protected.

DISA Rule

SV-223898r561402_rule

Vulnerability Number

V-223898

Group Title

SRG-OS-000080-GPOS-00048

Rule Version

TSS0-ES-000250

Severity

CAT I

CCI(s)

• CCI-001499 - The organization limits privileges to change software resident within software libraries.
• CCI-000213 - The information system enforces approved authorizations for logical access to information and system resources in accordance with applicable access control policies.
• CCI-002235 - The information system prevents non-privileged users from executing privileged functions to include disabling, circumventing, or altering implemented security safeguards/countermeasures.

Weight

10

Fix Recommendation

Evaluate the impact of correcting the deficiency. Develop a plan of action and implement the changes required to protect APF Authorized Libraries.

Configure ESM data set rules to limit WRITE or greater access to libraries included in the system REXXLIB concatenation to system programmers only.
Configure ESM data set rules allow READ access to only appropriate Started Tasks and Auditors.
Configure ESM data set rules to log WRITE or greater access (i.e., successes and failures).

Check Contents

Refer to AXRxx member of PARMLIB for each REXXLIB ADD statement.

If the ESM data set rules for libraries in the REXXLIB concatenation restrict WRITE or greater access to only z/OS systems programming personnel, this is not a finding.

If the ESM data set rules for libraries in the REXXLIB concatenation restrict READ access to the following, this is not a finding.

Appropriate Started Tasks
Auditors
The user-id defined in PARMLIB member AXR00 AXRUSER(user-id)

If the ESM data set rules for libraries in the REXXLIB concatenation specify that all (i.e., failures and successes) WRITE or greater access will be logged, this is not a finding.

Vulnerability Number

V-223898

Documentable

False

Rule Version

TSS0-ES-000250

Severity Override Guidance

Refer to AXRxx member of PARMLIB for each REXXLIB ADD statement.

If the ESM data set rules for libraries in the REXXLIB concatenation restrict WRITE or greater access to only z/OS systems programming personnel, this is not a finding.

If the ESM data set rules for libraries in the REXXLIB concatenation restrict READ access to the following, this is not a finding.

Appropriate Started Tasks
Auditors
The user-id defined in PARMLIB member AXR00 AXRUSER(user-id)

If the ESM data set rules for libraries in the REXXLIB concatenation specify that all (i.e., failures and successes) WRITE or greater access will be logged, this is not a finding.

Check Content Reference

M

Target Key

4102

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